diff options
Diffstat (limited to 'drivers/gpu/drm/tegra')
| -rw-r--r-- | drivers/gpu/drm/tegra/gr2d.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c index de288cba3905..ba3722f1b865 100644 --- a/drivers/gpu/drm/tegra/gr2d.c +++ b/drivers/gpu/drm/tegra/gr2d.c @@ -4,9 +4,11 @@ */ #include <linux/clk.h> +#include <linux/delay.h> #include <linux/iommu.h> #include <linux/module.h> #include <linux/of_device.h> +#include <linux/reset.h> #include "drm.h" #include "gem.h" @@ -19,6 +21,7 @@ struct gr2d_soc { struct gr2d { struct tegra_drm_client client; struct host1x_channel *channel; + struct reset_control *rst; struct clk *clk; const struct gr2d_soc *soc; @@ -208,6 +211,12 @@ static int gr2d_probe(struct platform_device *pdev) if (!syncpts) return -ENOMEM; + gr2d->rst = devm_reset_control_get(dev, NULL); + if (IS_ERR(gr2d->rst)) { + dev_err(dev, "cannot get reset\n"); + return PTR_ERR(gr2d->rst); + } + gr2d->clk = devm_clk_get(dev, NULL); if (IS_ERR(gr2d->clk)) { dev_err(dev, "cannot get clock\n"); @@ -220,6 +229,14 @@ static int gr2d_probe(struct platform_device *pdev) return err; } + usleep_range(2000, 4000); + + err = reset_control_deassert(gr2d->rst); + if (err < 0) { + dev_err(dev, "failed to deassert reset: %d\n", err); + goto disable_clk; + } + INIT_LIST_HEAD(&gr2d->client.base.list); gr2d->client.base.ops = &gr2d_client_ops; gr2d->client.base.dev = dev; @@ -234,8 +251,7 @@ static int gr2d_probe(struct platform_device *pdev) err = host1x_client_register(&gr2d->client.base); if (err < 0) { dev_err(dev, "failed to register host1x client: %d\n", err); - clk_disable_unprepare(gr2d->clk); - return err; + goto assert_rst; } /* initialize address register map */ @@ -245,6 +261,13 @@ static int gr2d_probe(struct platform_device *pdev) platform_set_drvdata(pdev, gr2d); return 0; + +assert_rst: + (void)reset_control_assert(gr2d->rst); +disable_clk: + clk_disable_unprepare(gr2d->clk); + + return err; } static int gr2d_remove(struct platform_device *pdev) @@ -259,6 +282,12 @@ static int gr2d_remove(struct platform_device *pdev) return err; } + err = reset_control_assert(gr2d->rst); + if (err < 0) + dev_err(&pdev->dev, "failed to assert reset: %d\n", err); + + usleep_range(2000, 4000); + clk_disable_unprepare(gr2d->clk); return 0; |